var sw = screen.width,
    sh = screen.height;
$(window).on("orientationchange",function(){
    if(window.orientation==180||window.orientation==0) {
        // 豎屏 sw
        // ...
    };
    if(window.orientation==90||window.orientation==-90) {
        // 橫屏 sh
        // ...
    }
});

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